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' f W. RUMBLB MAGHINE EUR MAKING WOOD SGRBWS.

N8. 288,828. 118-8811888 Aug.' 21, 1888.

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(No Model.) 6 Sheets-Sheet 2. WVRUMBLB. MACHINE POR MAKING WOOD SGREWS.No. 288,420. Patented Aug. 21, 1883.

(No Model.)

MAGHINB FOR MAKING WOOD SGRBWS. No. 283,420. Patented ug. 21, 1883.

` 6 Sheets-Shanna?. 3. W. RUMBLE.

6 Sheet-s-Sheet 4.-

(No Model.)

W. RUMBLE. f

MACHINE PQR MAKING WOOD SGRBWS. No. 283,420. Patented Aug. 2l, 1883.

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. I l 6 Sheets--Sheet 5. Y W. RUMB'LE. v l MACHINE FOR MAKING WOODSGREWS.

Patented Aug. 21, 1883.

' (No Model.)

6 Sheets-Sheet 6.l W. RUMBLE. MAGHINE POR MAKING WOOD SGKREWS.

519.283.429. Patented Aug. 21,V lags.

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n. Putas mmv-wim "im D r :UNITED STATES PATENT OFFICE.

TILLLrlvI RUMBLE, OF NEWT-YORK, N. Y., ASSIGNOR TO VALLACE C. AN- DREWSAND "WILLIAM F. SHNN, BOTH OF SAME PLACE.

y MAcHiNE Fou MAKING wooo-sCREws.

SPEGFICATION forming part-of Letters Patent No. 283,420, dated August21, 1883.

- Application filed December 23, 188|. (No model.)

T aZZ w/bom it may concern,.-

Be it known that I, WILLIAM RUMBLE, of the city, county, and State of`New York, a citizen of the United States, have invented a new anduseful Machine `for Making Vood- Screws, of which the following is acorrect description or specification.

The machine is of that class of screw-machines in which the thread ofthe screw is formed by rolling pressure.

In the accompanying-drawings, Figure 1 is a top-view of the machine.Fig. 2 is a side 'view or elevation. Fig. 3 is atop view of thethreading-rolls, with the shaving mechanism and three of the primarythreading-rolls removed and partof the frame broken away, so as to showthe point-threading rolls,which lie directly beneath the primary rolls.said figure also showing one of the adjustable boxes in which thespindles of the rolls revolve. Fig. 4 shows the holder in which theblank revolves while the point is being threaded. Fig. 5 is anelevation, and Fig. 6 is a plan of the mechanism "for turning the heads.Fig. T is a section through the edges of the primary rolls,

'showing the means for removing the screw.

Fig. Sis a top view of the mechanism for feeding the blanks to thenicking-saw. Fig. 9 is a vertical section through the center, as shownin Fig. 8, except as to the springs ing-shaft, which are in projection.Fig. 10 is atop viewlof the cam for operating the feedflipper for thehopper. Fig. 11 is a vertical plan view of the cam and connected parts.Fig. 12 is vertical -section through the cam and the connected parts atright angles to the view in Fig. 11. Fig. 13 is a plan of the roll E andthe guide Lf Fig. 14 is a central vertical section of parts shown onFig. v13. Fig. 15 is a vertical section of the gearing which drives thethreading-rolls. Fig. 16 is a horizontal section on the line a: a: inFig. 15, showing the pitch-lines of the teeth by dotted lines.

. Fig. 17 is a plan of two threading-rolls, showing the method ofremoving the blank.r The difference of radius of the rolls is somewhatexaggerated so as to show it more clearly. Fig. 18 is a plan ci' twopoint-threading rolls, showing the method of removing the screw. 5oFig.V 19 is a side view of the poilit-threadingy and drivl rolls and theslide-bar which helps in removing the screw.

rlhe letters of reference are Vthe same in all the igures of thedrawings. A refers to the fra-nie. B is the main driving-shaft, whichcarries directly the cam Q, the bevel-gear wheel b', and the bevel-gearwheel b, which gears with and imparts motion to the bevel-gear wheels Cand C. The bevelgear wheel C is mounted on the central spindle, C?,which has its lower bearing in a part of the frame A', and bears andcarries with it the central threading-roll, E. The bevel-geaiv wheel Cis mounted on a central spindle, C",

`(shown clearly in Fig. 15,) which is in a line with and below thespindle C2. On the spindle C* is mounted the gear-wheel C, which itcarries, and which gears with and drives the six gear-wheels, D, whichare mounted on the spindles D. The spindles Dbear the primaryTthreading-rolls E, the point-threading rolls F F, Src., and the cams G.The gear-wheel C3 is more th an twice the width ofthe gear-wheelD. Eachalternate wheel D isplaced lower than the others, and revolves belowthem, because if the wheels D were all in the same plane they wouldclash with each other. rlhe bevelgear wheels C Y and C are driven by thebevel-gear b in opposite'dircctions. The motion of gear C is reversed inthe gears D, so that they rotate in the same direction with thebevel-gear C, and the spindles G2 and D' all rotate Vin the samedirection; bearing with them the threadingrolls E and E, all rotating inthe same direction, so that the periphery ofthe roll E travels in anopposite direction to the peripheries of the rolls Eat the places oftheir nearest approach, which are at the chucks z',- and a screwblankstanding in the chuck t, between and in contact with the rolls E and E,is made by them to revolve on its axis. So, also, the peripheries of therolls F F', &c., at the places of their nearest approach, which are atthe holders f 1, travel in opposite directions, and cause the blank orscrew in the holder f2, the4 point being between the point-threadingrolls F F', &c.,and in contact with them, to rotate on its axis.

, The primary threading-rolls E and E are all lalike in form anddimensions, and have formed on their-faces or peripheries the threadwhich is to be impressed'into the screw-blanks. The threads are allalike and of uniform pitch, and run from the bottom to the top in thedirection of 'the motion. The spiral form of the rolls is clearly shownin Fig. 17, but the difference in the radius, being in fact but a smallamount, is shown in exaggerated proportion in the figure. There is anotch, e, in the face of the roll E', and a notch, c2, in each of therolls E. At that side of the notch which is last at the chuck i, in thedirection of the motion, is thc smallest radius of the roll, and theradius increases in passing around the roll until, arriving at thenotch, the increase is equal in amount to the depth of the thread. Thethread may be cut to the full depth all around the roll, or it may berun out to nothing at the place of the least radius.

rlhe boxes or bearings H, in which the spindles D revolve, areadjustable by means of the screws h and IL', Fig. 3, so that thedistance between the central roll, E', and the rolls E may be regulatedas required.

rlhe point-threading rolls F are formed in two integral sections. Theupper part, wide enough to bear two full threads similar and equal tothethreads of the primary-rolls, where the thread is full, iscylindrical, and the threads are of full depth all round. rlhe cylinderhas the same radius as the largest vpart of the primary threading-rolls.The lower part of the roll is conical and of unequal radius. The form ofthe face is such that the space inclosed by the two rolls, where thescrew is placed between them, is of the form of the point of the screw.'The periphery of the roll is divided into two equal parts by the notchesf3 and j, (see Fig. 18,) and the peripheries of both parts are alike,increasing inradius in regular proportion from notch to notch, theincrease being equal in amount to the depth of the thread,and theYlarger partyfollowing the smaller as the wheel rotates past a givenpoint. The threads on the conical part are in continuation of those onthe cylindrical part, and are of the same pitch. The notches f 3 and f*are for the purpose of allowing the points of the blanks to drop betweenthe rolls when they are placed in position for being pointed, and forremoving them' when finished, and the rolls are so mounted in relationto each other that as they rotate the notch in one roll will be oppositethe notch in the contiguous roll at the holder f, thus forming a spacebeneath the holder into which the point of the screw will drop. Theprimary roll E and the guide d deliver six' blanks into the chucks toeach revolution of the roll E, being one to each sixty degrees of thecircumference; and as the pointingrolls F F, &c., rotate in the sametime as the roll E', it followsthat one blank will be delivered.y to thepointing-rolls to each sixty degrees of their rotation. After the firstblank is deposited in the holder f2 between the rolls F5 and F, the rollF rotates sixty degrees, .when

which incloses the spindle D.

tube f the notches f3 and f 4 will be beneath the holder to receive thepoint.

To assist in the removal of the finished screw i by the notches aslide-bar, W, (see Figs. 18 and 19,) is placed above each of the rolls FF', Ste.

One end ofthe bar is divided and forms a yoke of the bar is fitted toand placed in a slot in the side of the holder f2, and it is thus heldin its place,with freedom to move back and forth in the line from thespindle to the holder. The end of the bar passes through the side of theholder and nearly in contact with the point of the screw, with the otherend in contact with the spindle, in which position it is held by thespring W2. Projecting from the lower side of the bar is a pin, W3, andon the face or side of the roll is projection W, eccentric with thespindle, so that it will impinge against the pin y W3, and thus move thebar WV against the point of the screw in the holder and carry the screwover, so that the notch in only one of the rolls (that notch which ismoving outward from the center of the machine) will come in contact withthe screw and draw it out of the holder and throw it out of the machine.

In the triangular spaces between each three adjacent primarythreading-rolls are th e chucks blocks I, iirmly secured to the frameofthe machine, the tops being iiush and even with the tops of the rolls.Sufficient space is allowed between the chuck-blocks and the rolls, sothat there shall be no contact between them. In the spaces between theends of two adjacent chuck-blocks, adjacent to the roll E', and betweenthe rolls E and E, are the chucks in which the blank is placed whilebeing threadedV and turned, the width ofthe chuck between thechuck-blocks being such that the blank is held loosely in an uprightposition, and the space between the rolls E and E is so regulated by theadjusting-screws h and h that the blank will be tightly pinched betweenthe rolls as soon as they begin to rotate after the blank is placed. Thedepth of the chuck is regulated by the screw l',which is set in avertical position in the bottom ofthe chuck, and is screwed up or downto suit the length of the blank.

Attached to the top of the chuck-block, on

that side of the chuck which is last reached by a point in the peripheryof the roll E as it rotates, is a hook, j, the vpoint of which projectsover the roll E and reaches backward in the direction of the motion, andso that the point will be at a sufiicient distance from the The otherend IOO IIO

esame 1 faces of the chuck-blocks to inclose a blank loosely betweenthem. The heel of the hook is a continuation upward of the side of thechuck.

In the outer end of the chuck-block isa tubular opening, f, down which ablank may pass, terminating in the holderf, at a point directly abovethe space between the pointthreading rods F E', the., and in a linebetween theirY centers. Into the lowerpart of the holder f yis a hoider,ff, which is adjustable vertically, being held in f by a set-screw orotherwise; The holder f2 is so formed that the screw hangs by its head,and it is open on the side opposite the center of the machine, so that ascrew may p pass out of it sidewise, and is so enlarged at the bottom,on the side opposite the slide-bar W, that the point of the blank may bemoved in that direction.

Attached to the top ofthe chuck-block, at its outer end, is a hook, e,which projects over the roll E, and issimilar in shape and function tothe hook j. The lieel of this hook is a continuation of .the side ofthetube j.

Inserted in each of the chuck-blocks I is a stud, 7c', the upper part ofwhich is threaded and has two nuts, li". These studs and nuts supportthe ways or guides K, on which are mounted the tool-holders l; to holdthe cuttingtools which turn the tops of the screws. Each tool-holder hasa stem, 7a2, projecting through a suitableopening in theV guide K. Theend k of the stemis held in contact with the 'periphery of the cam G,and by the action ofthe cam the tool-holder is moved forward and thetool brought to bearon the head of the blankheld and rotated in thechuck liuto the periphery of the central roll, E', is inserted awedge-shaped projection or lug, e, of sufficient projection to reachacross the chuck t. The lug precedes the notch e in the direction of themotion of the roll a short distance. A. groove is cut in the face ofeach chuck-block for the lug to move iu. The lug is wedge-shaped on itsforward side, so that when it encounters a blank in the chuck t" it willmove it out into the notch e2 in the side of the roll E. The rolls E aremounted in such a relative position with the roll E that the lug e willarrive at the chucks i at the same time with the notches e2 in the rollsE.

The hopper M may be of any of the many `known forms 5 but that shown inthe drawings is preferred. 1t is a pan with a slot in the bottom inwhich the lifter or dipper works. The dipper is operated by the cani Qby means of the pitman q. The cam Q is xed to and carried by the mainshaft B. On one side of the cam-wheel is av groove, g5, and on the otherside a groove, Q6, formed in the shape of two semicircles of differingdiameters, and tangent to each other at it?, their point of union. Thedifference in the diameter of the semicircles is equal to the motionrequired in the pitma'n. The semicirclesfcrming the groove g5 are thecomplements of those forming the groove q,

the centers of the circles being on a line drawn across the disk of thecam through'its center. The groove q begins near the periphery of thewheel at a, and running through two half-circles terminates at a nearthe axis. Opposite to the termination n of groove Q5 the groove thehalf-circles terminates opposite to the beginning of (j). The ends ofvthe grooves are sloped from their bottomsto the face of the wheel, sothat fthe friction-rollers which run in them may readily slide out atthe ends.

On each side of the cam-wheel is a standard, t and t', and in thestandards are recesses T and T', in a vertical line over thedrivingshaft and on the sides of the standards adjacent to the cam. Inthe recesses the arms q and (jwhich are the termini of the pitman q,work. The recesses are of suiiicient breadth at right an gies to theface ofthe cam to allow of a motion of the arms q and q2 to and from thecam. At the extremity of the arms, on the side next to the cam, aremounted friction-rollers q" and q, of a diameter and thickness to movefreely in the grooves q5 and q". The arms g and q2 are at such adistance apart that when one of the friction-rollers is in the groovethe other is out. If the roller q* is in the groove g5 and the cani' rowin Fig. 11, then when the roller arrives at the end of the groove a itwill be pushed out of the groove by the incline and the rotation of thecam and the roller q will be moved into the groove Q6. Thus the pitmanwill be made to vibrate sidewise in the recesses T and T', and to moveup and down, making a complete reciprocation to two turns of thedrivingshaft and cam. Each ofthe grooves covers one entire rotation ofthe cam; but they may be so constructed that each groove shall cover twoor more revolutions, in which case the pitman will make a completereciprocation'in four or more revo lutions of the cam. Vhen the dipperof the hopper is raised, the upper face of it, in which the blanks hangby their heads, has such an pass onto the ways or guides O Q, which leadon such an incline that the blanks will slide down by the action ofgravity to the nickingsaw and horizontally under the nickingsaw, whenthey are again inclined to the same pitch as above the nicking-saw, andlead to a point directly over the center of the central threading-roll,E', where they terminate in a vertical tube, 0*, inside of which isfitted a thimble, O5, which is open at the sidetoward the guides, andcan be adjusted vertically in the tube O. The upper portions of theguides O O are attached to the frame of the machine at the hopper and atO". The lower portion is attached to the frame by two set-screws at O3,by which setscrews it may be adjusted to the desired height, and whenthe iower part of the guides is set lower at 03 than the upper partthere will be a drop at that point.

K Attached tothe upper end ofthe central spin q on the other sidebegins,and running through revolves in the direction indicated by thear- V IOO IIO

inclination that the blanks will slide down and dle, C2, is the guide d.It is so fitted to the spindle that it turns with it, but may be adyjusted vertically and held in position lby the set-screw cl". The guided terminates in a short vertical tube, d, directly overthe notch eAinthe side of the roll E. The guide may be on an incline, so that theblanks will fol* low it by the force ofgravity; or it may be level andthe blanks made to traverse it by the centrifugal force imparted to themby the rotation of the guide as carried round by the spindle C2; or theymay be at such an incline that both forces will act together in carryingthe blanks to the tube d. The outer side of the tube arrests the onwardmotion of the blank, and it drops into the notch e, the head resting onthe jaws di.

The nicking-saw S and the feed-wheels L L are driven by the gear b/ onthe main shaft and gears p, l?, and u, mounted on the spindies or shaftsP and N. From the shaft N the saw is driven by the gears NZ and N3, andthc vfeed-wheels by the wormgear a and n, and the feed-wheel shafts aregeared to run together by the spur-gears n1 a". are so speeded that siXblanks are fed to the saw during one revolution of the threading-roll E.The feedwheels rotateA immediately beneath the level part of the guidesO O. rlhe pitchlines of the teeth Z meet in the center of the guides. Aline through the centers of the 'feed wheels is at right angles to theline of the guide. The leed-wheels are so mounted that vthe spacesbetween the teeth on one wheel come opposite to the spaces between theteeth of the other, and the points ofthe teeth of either wheel iit intogrooves inthe other wheel, which grooves are cut around the wheel anddivide the teeth into not less than two parts. on each wheel. Thespindles yr o', on which lthe iced-wheels are mounted, rotate in themovable boxes r3, and the feed-wheels are pressed toward each other bythe springs r" r2, placed between the .movable boxes fr and the caps'r'. The guides are shown by dotted lines in Fig. S, where they passover the feedwheels, so that the teeth Z Z of the feed-wheels maybeclearly shown. The saw S rotatesin 4a vertical plane parallel to thcline of the guides O O, and immediately over their center line, and atsuch a height above them that it will cut the proper distance into thehead of' the blank, which is carried under the saw by by thefeed-wheels.

The operation of the machine is as `follows: The vlower part of theguide O', the thimble O, the guide d, the screws i in the bottoms ofthechucks, and the holders/2, also the way or guide K, are adjusted and setat the proper height for the length of the blank to be operated upon,and the several threaded rods, E, are adjusted so as to give the properdistance between .them and the central rod, E. The tools for turning theheads must be properly set, and also the saw. The blanks are placed(previously headed and pointed) in the hop- The feed-wheels L L togetherby the springs r2 r2, and prevented from turning while being acted on bythe saw. As the feed-wheels rotate the blanks are carried under the edgeof the saw and the nick is cut in them. the feed-wheels until they reachthe lower incline, O, ofthe guides O O, down which they slide, and dropthrough the tube O* O5 into the guide d, exactly in the center of itsrotation. rlhey then, by the force'of gravity, or by their centrifugalforce, or by both combined, traversefthe guide d and drop into the tubed" and the notch c, and the shank rests between the centralthreading-roll, E, and the chuck-block I. by the rotation ofthe roll Ewith the guide (Z, and passes between the point of the hook j and thechuck-block, andas it is still carried forward it is pressed by the hookout of the notch e/ and into the chuck As soon as the iirstV blankleaves the notch c another drops into it, and as the roll E', with theguide d, continues to rotate the second blank is, in the saine manner asthe first, placed in the second chuck, fi, and so, in like manner, ablank is placed in each ofthe six chucks at every revolution of the rollE. When the blank is placed in the chuck, and as the rolls E and Erotate, it is between the rolls at that place in the periphery of eachofthe rolls where the radius is least, and consequently where the spacebetween them is greatest, and the blank is slightly pressed between therolls and caused to rotate. As the rotation of the rolls continues thespace between them diminishes and the blank is more firmly held, and thethread on the rolls is thus pressed into the blank, until, with acomplete revolution of the rolls, the thread is fully formed on theblank. As soon as the blank, after it is placed in the chuck, is rmlygripped by the threading rolls, the cutter for turning the head is movedforward by the cam g and pressed against the head of the` blank, and bythe rotation ofthe blank against the edge of the tool the head isturned. Before a complete rotation of the rolls is made the point g,which is the largest part of the cam, passes the end ki of the stem ofthe,toolholder, and the spring k drives back the tool away from theblank. far finished as it can be in the chuck z', and as the notch cl inthe roll E, and the lug c, attached to the roll E, arrive simultaneouslyat the chuck i, the lug, in passing the chuck,

They are still carried forward by The blank is carried'foiwvard` Thescrew is now as IOO TIO

forces the blank out of it and into the notch e",

in which position it is carried between the body of the roll El and theface of the chnckblock I to the hook e, and is then, by the,

combined action of the rotation ofthe roll E and the hook e, transferredto the tube j', through 5 which it passes into the holder f 2, and thepoint of it drops between two point-threading rolls, F, Src., in thespace made by the notches f3 and fi. As the rolls F F', Ste., rotate,the full threads on the cylindrical part of the rolls imi'o pingeagainst 'the threaded portion ofthe blank and cause it to revolve andadjust itself to the threads on the thread-pointing section. The threadson the conical part of the rolls are then by the continu ed rotationbroughtto r 5 bear on the pointed part of the blank, and it is thusthreaded and the screw is finished., The gears below the threading-rollsare protected by a covering, so that the screws shall `not fall intothem. All the blanks lodged, as

2o before described, in the sixchucks are treated in the same manner asto threading, turning, and pointthreading.

On Fig. 17 the chuck-blocks I are shown by dotted lines.

' 25 The rolls F F', Src., are in two sections only,

30 I. The combination of the cam Q, having` the groovesl g5 and g, withthe standards t and t, having the recesses T and T', and the pitman q,having the arms q 1f, substantially as described. 35 2. The combinationofthe toothed feeding- Wheels L L, the movablebearings 1", the springs1, and the saw S,With the guides O O, substantially as described.A

3. The combination ofthe roll E, having 4o notch e', and the revolvingguide d, substantially as shown and described.

4. The combination of the guides O O with the roll E', having notch e',and the revolving guide d, substantially as described.

5. The combination oi' the revolving 'guide 45 d with the roll E',having the notch e, the guideblocks I I, `the hook j, and the roll E,having the notch e2, substantially as described.

6. The combination of the roll E', having. the notch e', with theguide-blocks II, and the 5o hook j, substantially as shown anddescribed.

7. The combination of the roll E', having the Wedge-shaped luge, withthe blocks I I, and the roll E, having the notch c2.,

8. The combination of the rolls E E' with 55 the movable tool-holder 7a,the carriage K, the spring k3, andbam Gr,r substantially as described.

9. The combination of the roll E, having the notch e2, with theguide-blocks I, and the 6o booke, substantially as described.

10. The combination of the roll E, having the notch with theguide-blocks I, the hoolr e, the Wellf, and the pointthreadingroll F,substantially as described. 6 5

11.` The combination of three or more rolls for threading screw-blanks,all of which are made to rotate in the same direction, and around one ofwhich, as a central roll, the others are ar ranged, concentrically, insuch a manner that 7o screw-blanks may be placed between each of theconcentric rolls and the central roll to be threaded.

12. A roll or rotating die for threading screw-blanks, the entireperiphery of which is 7 5 formed'or described about the center on whichthe die rotates by a radius of constantly increasing length.

13. The combination, in a machine for threading screw-blanks, oi'twopairs of rolls So A or dies, one pair of whichfthread the Shanks, andthe other pair the points of the screws, substantially as shown anddescribed.

XVM. RUMBLE.

lVitnesses W. J. Lnnnnnn, FRANK Liann.

